How to Change the Coolant in a 1983 Yamaha IT250
Shop parts for a 1983 Yamaha IT250 Dirt Bike.
Regularly changing the coolant is essential to keep your 1983 Yamaha IT250 running cool on any ride. Although a straightforward task, attention to detail prevents overheating and protects the unique features of the IT250's two-stroke engine. Below is a model-specific step-by-step guide, plus key tips every owner should know.
What You Need
- Fresh coolant (preferably pre-mixed, silicate-free formula suitable for aluminum radiators)
- Distilled water (if mixing coolant yourself)
- Drain pan
- Socket or wrench set
- Phillips or flathead screwdriver (for shrouds or side covers, if needed)
- Funnel
- Gloves and safety glasses
- Clean shop towels
Step-By-Step Instructions
- Preparation: Ensure the motorcycle is completely cool and parked upright on stable ground. Remove any bodywork or shrouds to access the radiator cap and lower radiator hose or drain bolt.
- Drain the Old Coolant: Place a drain pan under the water pump or lowest radiator point. Locate the drain bolt (usually on the engine or lower water pump housing); loosen and remove it. Remove the radiator cap to let coolant flow freely. Allow all old coolant to drain out completely.
- Flush the System (Recommended for Older Models): For bikes like the IT250 that may not have frequent coolant changes, flush the system by reinstalling the drain bolt and filling the radiator with distilled water. Run the engine briefly (no longer than a minute), then turn it off, let it cool, and drain again. Repeat until the water runs clean.
- Replace the Drain Bolt: Inspect the drain bolt and washer; replace if worn. Reinstall and tighten the bolt securely to prevent leaks.
- Add New Coolant: Using a funnel, slowly pour fresh coolant into the radiator up to the bottom of the filler neck. If your coolant is concentrate, dilute with distilled water (typically 50/50). Fill the overflow reservoir (if equipped) to the "Full" mark.
- Bleed Air from the System: Start the engine and let it run with the radiator cap off. Gently rev and rock the bike to help bubbles escape. Top off coolant as needed. When bubbling stops and the coolant level stabilizes, reinstall the radiator cap. Let the bike reach operating temp, then shut it off and cool completely.
- Final Checks: After cooling, check both the radiator and reservoir levels again, topping off as needed. Inspect for any leaks from the drain bolt, hose connections, or radiator cap.
Unique IT250 Considerations
- The IT250's two-stroke engine can run hotter if coolant is old or levels are low. Never substitute with plain water – always use the correct spec coolant.
- Check the radiator's fragile aluminum fins while you're there. Bent fins can reduce cooling efficiency, a common issue on vintage IT bikes after years of trail riding.
- If your IT250 features an overflow reservoir, make sure the hose is clear and not kinked to maintain proper expansion and contraction of the coolant during heat cycles.
- Sourcing radiator caps and drain bolts for vintage models is sometimes challenging, but MotoSport stocks the parts to keep your IT250 original and running strong.
Best Practices & Maintenance Tips
- Service coolant every two years, or annually if riding in muddy or wet environments.
- Always dispose of old coolant safely; it's toxic to pets and the environment.
- After any coolant change, monitor the coolant level for the first few rides to ensure all air has fully evacuated.
Keeping your 1983 IT250's cooling system fresh will ensure legendary Yamaha reliability through every adventure. If you need any replacement parts or service supplies for your vintage Yamaha, shop parts for a 1983 Yamaha IT250 Dirt Bike.
Related Shopping Categories
Shop Radiators for a 1983 Yamaha IT250 Dirt Bike.
Shop Coolant for a 1983 Yamaha IT250 Dirt Bike.
Shop Temperature Sensors for a 1983 Yamaha IT250 Dirt Bike.
Shop Tools for a 1983 Yamaha IT250 Dirt Bike.
Shop Radiator Hoses for a 1983 Yamaha IT250 Dirt Bike.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.